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This is a personal contemplation on the state of ocean wave measurement, historically, and with an eye toward the future. The conceptual basis which leads to the conventional wave measuring instruments has been in practice for over six decades which is basically single point observations of three-dimensional waves. We need new conceptual advancement and new instrumentation to rejuvenate our res...

Sixty years ago, August Sonnefeld of Zeiss reported on observations with experimental telescopes. The goal of his investigation was to determine the ideal amount of distortion applied to optical instruments that are used in combination with the human eye. His studies were inconclusive and partially contradictory. We have picked up this problem once again, adopting a modern point of view about t...

A new scoop-shaped conformation of C-methylcalix[4]resorcinarene has been identified; it is a hybrid of the previously observed crown- and flattened cone conformations.

The aim of this paper is to identify utilization schemes developed by students and teachers in their interaction with educational workstations in the electronic measurement and instrumentation laboratory at the Department of Electrical Engineering in the Federal University of Minas Gerais (UFMG), Brazil. After that, these schemes were used to design a new workstation. For this, it was important...

A novel instrumentation system has been designed for the correct detection of small dc currents emitted by characteristics points of the human skin using a non invasive probe. The probe presents an integrated pressure compensation system based on a force sensor allowing to obtain reliable and repeatable measurements that are virtually insensitive to pressure fluctuations. The current acquisitio...